TJ Mechanical engineering and machinery TD Environmental technology. Sanitary engineering 5 GE Environmental Sciences 3 Biotechnology 2 VM Naval architecture. Shipbuilding. Marine engineering 2 Biodiesel fuels 1 Corrosion and anti-corrosives 1 Engineering geology. Rock mechanics. Soil mechanics 1 Fatigue testing machines 1 HD Industries. Land use. Labor 1 HE Transportation and Communications 1 Heat engines 1 Machine construction (General) 1 Machine design and drawing 1 Materials of engineering and construction 1 Mechanical movements 1 Mechanics applied to machinery. Dynamics 1 Mechanics of engineering. Applied mechanics 1 Miscellaneous motors and engines.Including gas, gasoline, diesel engines 1 Oils, fats, and waxes 1 Processes, operations, and techniques 1 Production of electric energy or power. Powerplants. Central stations 1 T Technology (General) 1 TA Engineering (General). Civil engineering (General) 1 TL Motor vehicles. Aeronautics. Astronautics 1